Hearing aid streaming audio is not better than dedicated headphones. Full stop.
Unquestionably true!
I tried every trick in the book to get streaming audio to reproduce a modicum of bass, to no avail.
I would go on my walks, and just the ambient noise, and traffic was overwhelming, even with the mics muted.
My solution was to get a pair of Etymotic ER3SE IEMs!
With the Dual flange eartips, I get max isolation (have to watch for traffic), and full, detailed frequency response.
At home, at my computer, my Sennheiser HD6XX are the answer.
Back to your original issue, I’m curious about a few things:
Does the whistling only occur with ANC enabled?
Does it occur if you use theSony, or Bose passively, ie: wired?
Do you still have your Airpods, and do they whistle?
Just thinking, maybe it’s not the Mores.